Franklin, I don't think it matters too much what paint system you use
if the shell is repaired well and primed with a good quality primer
(preferably 2K in my opinion) And everything is allowed to dry properly.
As I said in a previous reply, providing you regard paint as the
crowning glory you should be OK
For the record on fiberglass I think a solid colour 2K is better than
base and clear because you can minimise the solvents used and it also
tends to be more durable and of course there are no issues with
adhesion between the base and (clear)laquer (although this shouldn't
be a problem)
The issue of water based paints is one which comes up again and again
for environmental reasons. There were problems with it back in the
eighties. The laquer (clear) was very prone to damage from such things
as bird poo and it also had poor adhesion in some cases. It all went
quiet for quite a few years but my rep' dropped a leaflet in about
water based basecoats so I guess they are still around.
None of my contacts within the trade in the UK have used water based
automotive paints.
On the subject of cellulose, there is nothing wrong with it but I
would always recommend 2K primer because cellulose solvents are a
problem on 'glass. Celly will loose its shine and it is more prone to
damage than 2K.
The other problem with celly is that the big paint companies donot
really support it any more so the product and things like quality of
solvents are not nearly as good as they used to be.
I "cut my teeth" spraying celly but sadly that is now over 30 years ago
2K paint is a better product ....... filthy stuff to use ..... but
good paint!
John